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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .button { background-color: #f4511e; border: none; color: white; padding: 16px 32px; text-align: center; font-size: 16px; margin: 4px 2px; opacity: 0.6; transition: 0.3s; display: inline-block; text-decoration: none; cursor: pointer; } .button:hover {opacity: 1} </style> </head> <body> <h2>淡入淡出按钮 - “淡出效果”</h2> <button class="button">悬停在我身上</button> </body> </html>